TSD Q8

Two boats, traveling at 5 and 10 kms per hour, head directly each other. They begin at a distance of 20 kms from each other. How far apart are they (in kms) one minute before they collide.
(a) 1/12
(b) 1/6
(c) 1/4
(d) 1/2

The relative speed is 15 km/hr = 15 km/60 min = 0.25 km/min = 250 m/min.

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